Parallel linkage with pivoted translating link

Abstract

A linkage, especially for the pedals of a skid-steered tractor vehicle for operating the boom arms and attachment carrier, which requires no machining or threaded couplings. The arrangement includes links made of flat bar stock. Pivotal connections between adjacent links are made by punched holes, pins and side connectors. Adjustment for linear travel is at the pedal or valve rather than in the linkage itself. Crossover in the linkage path is by a bridging link having an open slot with curved sides rocking on a flat sided pin whereby movement is transmitted laterally.

We claim: 
     
       1. An improved linkage for transmitting linear motion between a linear motion causing means and a linear motion responsive means, the improvement wherein the motion causing means and the motion responsive means are on spaced paths and linear motion is transmitted along longitudinally and laterally extending paths comprising a first link connected to the motion causing means, a second link connected to the motion responsive means, both on longitudinally spaced paths, a bridging link extending between the two along the laterally extending path, a connection intermediate the ends of the bridging link, said bridging link being made of flat bar stock and said connection comprising a punched opening having curved sides in the lateral direction, a flat sided pin received in said opening engaged with the curved sides of the opening in rolling anti-friction contact, permitting the bridging link to swing between the first and second links, retaining said pin and opening and said links in engagement. 
     
     
       2. The improvement according to claim 1 wherein the pin has a pair of shoulders upon which the bridging link rests. 
     
     
       3. The improvement according to claim 1 wherein the linkage is comprised of individual links, at least some of which are made of flat bar stock, a pivotal connection means permitting relative pivotal movement between adjacent sections, said connection means including a pair of holes, one in each of the adjacent link sections of a diameter greater than the thickness of the material along the axis of the holes, a pair of connection elements of thinner material, one on each side of the link section, having a pair of holes of smaller diameter located over the larger holes, and a pair of pins located in the smaller holes and loosely received in the larger holes whereby the use of machined parts is minimized. 
     
     
       4. The improvement according to claim 3 wherein the linear adjustments between the motion causing and motion responsive means is made at one or the other ends of the linkage by moving the said means.